PSCA GI:5031995 prostate stem cell antigen preproprotein 1 mkavllallm aglalqpgta llcysckaqv snedclqven ctqlgeqcwt 50 51 ariravgllt viskgcslnc vddsqdyyvg kknitccdtd lcnasgahal 100 101 qpaaailall palglllwgp gql